Project messed up after reopening

Question

Hello all,
I have been using logic for some time now and have never witnessed anything like that before.
I saved and closed the project then opened it and it didn't sound the same, as a matter of fact it was a terrible mess.
it turned out that most of the software instruments, both the ones that come with logic and third party, had all the settings turned to default.
that means e.g. ultrabeat and exs24 not loading the samples I set up before but the default ones and all the knobs turned to default, imagine what it does to 16 track multiinstrument.
it already happened twice, the first time I was hoping it was a bad dream.
It is as if saving the project worked only for the arrange window.
I recently installed a third party software called UVI workstation and I thought it may be the cuprit. But the problem also concerned  a project that didn't include the UVI at all.
It makes it practically impossible to work in logic. I really hope some of you guys can help because it's terrible.
I'll really appreciate any help
regards
my setup:
imac 2012 27''
32 gb ram
intel core i7
os mavericks
third party soft:
     NI razor
     kontakt player
     reaktor player
     UVI workstation

Answer 1

I just went on it, and only one track worked. The volume was up for each one. On one track it shows that there is volume on the bar but nothing can be heard. Both real instruments and the instrumental mp3 wont work. They worked before but just randomly stopped. On one of the real instrumental track the sound is very low and sounds like an echo.